dlizewski opened a new pull request, #18815:
URL: https://github.com/apache/nuttx/pull/18815
## Summary
* Added support for USB CDC-ECM host class. This host class is used for many
USB-Ethernet adaptors as well as USB modems.
* I also added support to select different configurations since the
USB-Ethernet adaptor I have only presents CDC-ECM as the 2nd configuration. I
split this into a separate commit.
## Impact
* Added a new host class
* Adds ability to sleect different USB configurations
* All changes behind Kconfigs so changes will only be seen if enabled
## Testing
* I have tested with with a few Quectel Modems that support CDC-ECM as well
as a USB Ethernet adaptor I had.
In the attached logs I loaded nucleo-h563zi:nshusbnet and connected the
USB-Ethernet adaptor nucleo-h563zi:nshusbnet (A Realtek RTL8153 Gigabit
Ethernet Adaptor with integrated hub).
I then enabled the interface, set DHCP, verified it got an IP, then pinged
8.8.8.8 with no packet loss.
Commands run:
```
ifconfig
ifup eth0
ifconfig eth0 dhcp
ifconfig
ping 8.8.8.8
```
[ecm_log.txt](https://github.com/user-attachments/files/27136407/ecm_log.txt)
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